When 'this' points to the Window object

window.js

console.log(this);

// returns the Window object
// Window {	postMessage: ƒ, 
// blur: ƒ, 
// focus: ƒ, 
// close: ƒ, 
// frames: Window, …}

function myFunction() {
	console.log(this);
}

// Call the function
myFunction(); 

// returns the Window object! 
// Window {	postMessage: ƒ, 
// blur: ƒ, 
// focus: ƒ, 
// close: ƒ, 
// frames: Window, …}